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JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS
1
Medium
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Understanding
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Assertion: A material which stretches more is more elastic.
Reason: Rubber is more elastic than steel.
Reason: Rubber is more elastic than steel.
View answer and explanation
Correct option: D
Both Assertion Reason are False
Option D is correct because a material that stretches more is less elastic, and steel is more elastic than rubber.
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Assertion: From the relation we can say that, if length of a wire is doubled, its Young's modulus of elasticity will also becomes two times.
Reason: Modulus of elasticity is a material property. A wire can be broken by applying a load of 200 N. The force required to break another wire of the same length and same material, but double in diameter, is Assertion(A): If radius of cylindrical wire is doubled, then this wire can bear four times stress.
Reason(R): By doubling the radius, area of cross-section will become four times.
Reason: Modulus of elasticity is a material property. A wire can be broken by applying a load of 200 N. The force required to break another wire of the same length and same material, but double in diameter, is Assertion(A): If radius of cylindrical wire is doubled, then this wire can bear four times stress.
Reason(R): By doubling the radius, area of cross-section will become four times.